A:铜绿加热能分解
B:氮气在通常状况下无色无味
C:氧气能支持燃烧
D:二氧化碳能使澄清石灰水变浑浊
分解因式:x2-2xy+y2+x-y=____
— Why not_____visiting Hangzhou? There are many places of interest there.